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Spin-exchange optically pumped polarized target for low-energy charged particle scattering experiments
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Image of FIG. 1.
FIG. 1.

Schematic diagram of TUNL polarized target system: (TC) target cell, (OPC) optical pumping cell, (DP) diaphragm pump, (SC) storage cell, (RGA) residual gas analyzer, (VP) vacuum pump, (SB) storage bottle.

Image of FIG. 2.
FIG. 2.

The target cell and holder. The pictures do not show Kapton foil epoxied on the cell.

Image of FIG. 3.
FIG. 3.

A drawing showing the sine-theta coil and target cell assembly on its mounting platform inside the scattering chamber. Not shown are the wiring harnesses which carry currents to each end of the copper rods, and the pressure sensor and input gas line which connect to the target cell capillary.

Image of FIG. 4.
FIG. 4.

Schematic cross sectional view of the sine-theta coil showing the 12 diagonally opposing pairs of current carrying rods, with current directions indicated. To create the vertical magnetic field shown, each line current is proportional to , requiring maximum (minimum) current values at and 270° (0° and 180°).

Image of FIG. 5.
FIG. 5.

Schematic diagram of the sine-theta coil circuit. One circuit drives each rod pair, and the output current is computer controlled. A National Instruments FieldPoint (FP) analog output module sets the input voltage of the operational amplifier. A FP analog input module monitors the output current of the MOSFET by measuring voltage across resistor. A FP digital output module controls the current polarity.

Image of FIG. 6.
FIG. 6.

Plot of left–right asymmetry of recoil vs NMR amplitude. The best-fit curve yields a calibration constant of .


Generic image for table
Table I.

Wall relaxation times for several materials.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spin-exchange optically pumped polarized He3 target for low-energy charged particle scattering experiments